Media Player can't continue to play after the progress bar is dragged.

This bug occurs in 5.3 version. It's ok in 5.2 version.

Method to Reproduce Issue One:

1. Directly click on the play video in MediaPlayer, drag the video progress bar;

1. Click the play/pause button, the video does not continue to play;

Method to Reproduce Issue Two:

1. Add Actor in Sequence, mount MediaPlayer on Actor;

1. Drag the Sequence timestamp, the video inside MediaPlayer does not continue to play;

From the performance point of view, it seems to be the same issue.

(A 5.3 example project is attached below.)[^MyProject.zip]

You can also check this UDN:

https://udn.unrealengine.com/s/question/0D5QP000002KdYs0AK/%E5%BC%95%E6%93%8E%E6%9B%B4%E6%96%B0%E5%88%B053mediaplayer%E6%92%AD%E6%94%BE%E8%A7%86%E9%A2%91%E5%87%BA%E7%8E%B0%E9%97%AE%E9%A2%98